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Mechanical characteristics of undisturbed coral gravel soils: The intergranular void ratio as a common governing parameter

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Title: Mechanical characteristics of undisturbed coral gravel soils: The intergranular void ratio as a common governing parameter
Authors: Watabe, Yoichi Browse this author
Sassa, Shinji Browse this author
Kaneko, Takashi Browse this author
Nakata, Yukio Browse this author
Keywords: Coral gravel soil
Undisturbed sample
Coral fragments
Silt matrix
Particle crush
Mechanical properties
Triaxial test
Issue Date: Oct-2017
Publisher: The Japanese Geotechnical society
Journal Title: Soils and foundations
Volume: 57
Issue: 5
Start Page: 760
End Page: 775
Publisher DOI: 10.1016/j.sandf.2017.08.007
Abstract: Coral gravel soils are composite soils comprised of large fragments of finger coral and fine particles from silt matrixes. When the amount of coral fragments is small, the mechanical behavior of the coral gravel soil is mainly governed by the silt matrixes, and when the amount of coral fragments is large, the mechanical behavior is mainly governed by the coral fragments. Undisturbed samples, called high-quality samples in the present study, were collected at large-scale coastal construction sites in Okinawa Prefecture and Kagoshima Prefecture, Japan. A series of triaxial CD-tests was conducted in the laboratory to evaluate the mechanical characteristics of coral gravel soils. The test results were examined from various viewpoints to find a common governing parameter for the mechanical behavior of coral gravel soils. It was anticipated that it would be difficult to interpret the mechanical behavior of the high-quality samples in a uniform manner because undisturbed coral gravel soils, in the form of natural sediments, are generally very heterogeneous. To provide a reference for the parametric interpretation of the test results showing the remarkable features of coral gravel soils, such as interlocking and particle crushing, the test data newly obtained for the high-quality samples were compared to the previous test results obtained for reconstituted mixtures having various volumetric percentages of coral fragments. It was found that an intergranular void ratio corresponding to 0.075 mm, in which particles finer than a grain size of 0.075 mm (i.e., particles of clay and silt) are regarded as voids, can be employed as a useful parameter in evaluating the shear strength of both reconstituted and undisturbed coral gravel soil samples.
Rights: © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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